Add Python 3.11 support to virtualbox 6.1

--- a/src/libs/xpcom18a4/python/Makefile.kmk
+++ b/src/libs/xpcom18a4/python/Makefile.kmk
@@ -26,7 +26,7 @@
 
 #
 # List of supported Python versions, defining a number of
-# VBOX_PYTHON[26|27|31|32|32M|33|33M|34|34M|35|35M|36|36M|37|37M|38|38M|39|39M|310|310M|DEF]_[INC|LIB] variables
+# VBOX_PYTHON[26|27|31|32|32M|33|33M|34|34M|35|35M|36|36M|37|37M|38|38M|39|39M|310|310M|311|311M|DEF]_[INC|LIB] variables
 # which get picked up below.
 #
 ifeq ($(KBUILD_TARGET),darwin) # Relatively predictable, don't script.
@@ -624,6 +624,52 @@
   endif
  endif
 endif
+
+ifdef VBOX_PYTHON311_INC
+#
+# Python 3.11 version
+#
+DLLS += VBoxPython3_11
+VBoxPython3_11_EXTENDS    = VBoxPythonBase
+VBoxPython3_11_EXTENDS_BY = appending
+VBoxPython3_11_TEMPLATE   = XPCOM
+VBoxPython3_11_INCS       = $(VBOX_PYTHON311_INC)
+VBoxPython3_11_LIBS       = $(VBOX_PYTHON311_LIB)
+
+ ifdef VBOX_WITH_32_ON_64_MAIN_API
+  ifdef VBOX_PYTHON311_LIB_X86
+DLLS += VBoxPython3_11_x86
+VBoxPython3_11_x86_EXTENDS    = VBoxPythonBase_x86
+VBoxPython3_11_x86_EXTENDS_BY = appending
+VBoxPython3_11_x86_TEMPLATE   = XPCOM
+VBoxPython3_11_x86_INCS       = $(VBOX_PYTHON311_INC)
+VBoxPython3_11_x86_LIBS       = $(VBOX_PYTHON311_LIB_X86)
+  endif
+ endif
+endif
+
+ifdef VBOX_PYTHON311M_INC
+#
+# Python 3.11 version with pymalloc
+#
+DLLS += VBoxPython3_11m
+VBoxPython3_11m_EXTENDS    = VBoxPythonBase_m
+VBoxPython3_11m_EXTENDS_BY = appending
+VBoxPython3_11m_TEMPLATE   = XPCOM
+VBoxPython3_11m_INCS       = $(VBOX_PYTHON311M_INC)
+VBoxPython3_11m_LIBS       = $(VBOX_PYTHON311M_LIB)
+
+ ifdef VBOX_WITH_32_ON_64_MAIN_API
+  ifdef VBOX_PYTHON311M_LIB_X86
+DLLS += VBoxPython3_11m_x86
+VBoxPython3_11m_x86_EXTENDS    = VBoxPythonBase_x86_m
+VBoxPython3_11m_x86_EXTENDS_BY = appending
+VBoxPython3_11m_x86_TEMPLATE_  = XPCOM
+VBoxPython3_11m_x86_INCS       = $(VBOX_PYTHON311M_INC)
+VBoxPython3_11m_x86_LIBS       = $(VBOX_PYTHON311M_LIB_X86)
+  endif
+ endif
+endif
 
 ifdef VBOX_PYTHONDEF_INC
 #
--- a/src/libs/xpcom18a4/python/src/module/_xpcom.cpp
+++ b/src/libs/xpcom18a4/python/src/module/_xpcom.cpp
@@ -84,7 +84,11 @@
 #  define MANGLE_MODULE_INIT(a_Name)    RT_CONCAT(a_Name, MODULE_NAME_SUFFIX)
 # endif
 # ifdef VBOX_PYXPCOM_VERSIONED
-#  if   PY_VERSION_HEX >= 0x030a0000 && PY_VERSION_HEX < 0x030b0000
+#  if   PY_VERSION_HEX >= 0x030b0000 && PY_VERSION_HEX < 0x030c0000
+#   define MODULE_NAME    MANGLE_MODULE_NAME("VBoxPython3_11")
+#   define initVBoxPython MANGLE_MODULE_INIT(PyInit_VBoxPython3_11)
+
+#  elif   PY_VERSION_HEX >= 0x030a0000 && PY_VERSION_HEX < 0x030b0000
 #   define MODULE_NAME    MANGLE_MODULE_NAME("VBoxPython3_10")
 #   define initVBoxPython MANGLE_MODULE_INIT(PyInit_VBoxPython3_10)